Mechanism of aerodynamic stabilization for long-span suspension bridge with stiffening truss-girder

Ueda, Toshio; Yasuda, Masahiko; Nakagaki, R.

doi:10.1016/0167-6105(90)90048-h

Cited by 17 publications

(7 citation statements)

References 1 publication

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“…For example, the Akashi Kaikyo Bridge (the length of the longest span is 1991 m) with a 2.15m height VCS installed in the centerline of the truss-type stiffening girder [7] and the Runyang Yangtze River Bridge (the length of the longest span is 1490 m, China) with a 0.65m height VCS on the top of the closed box girder [8]. Based on the numerical simulation, VCS have been verified to be an effective aerodynamic measure to improve the flutter performance of long-span bridges either with an open cross section or with a streamlined box cross section [9].…”

Section: Introductionmentioning

confidence: 99%

Flutter characteristics of twin-box girder bridges with vertical central stabilizers

Yang

Zhou

et al. 2017

Engineering Structures

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It has been well known that Vertical Central Stabilizers (VCS) have the potential of improving flutter performance of long-span bridges. However, the fundamental flutter mechanisms of VCS are still not fully understood so far. In this study, a series of windtunnel tests involving the combination of six representative heights and four types of VCS were conducted to fundamentally investigate the influence of VCS on flutter performance of twin-box girders with various Slot Width Ratios (SWRs). Experimental results show that the flutter instability of 20% SWR is significantly sensitive to the height change of VCS, whereas the VCS have little effect on the flutter performance for 80% and 100% SWR. In addition, the results from Two-Dimensional Three Degree of freedom (2D-3DOF) flutter analysis demonstrates that aerodynamic damping Part A with reference of flutter derivative A2 * makes the greatest contribution to the flutter instability for a 0.8 h/H VCS, while the role of Part D with reference of A1 * H3 * becomes critical for a short VCS (i.e. the ratio of h/H is less than 0.2). Besides, the results of Computational Fluid Dynamics simulation indicate that the geometry of VCS influence the transforming vortices' structures and pressure distribution under the central slotting. Finally, the modified Selberg formula presented in this study has the capability of predicting the critical flutter speed of twin-box girders with various SWRs and VCS.

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Section: Introductionmentioning

confidence: 99%

Flutter characteristics of twin-box girder bridges with vertical central stabilizers

Yang

Zhou

et al. 2017

Engineering Structures

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“…From the above analysis, it can be concluded that both the geometric scale and the installation position of the upper central stabilizer significantly influence the flutter mitigation effects of the double-deck truss girder. Based on the previous studies (Chen, et al, 2009; Ueda, et al, 1990), the main cause of flutter instability is the separated flow from the leading edge of the truss girder reattaching to the upper and lower surfaces with the phase lag relative to the torsional motion. According to the testing results in this study, it could be inferred that upper stabilizers installed on the upper deck at large heights can successfully prevent the flow reattachment on the upper deck surface and thus effectively suppress the torsional vibration of the main truss girder.…”

Section: Aerodynamic Flutter Mitigation Measuresmentioning

confidence: 99%

“…The mitigation of the flutter instability of steel truss girders has been studied by many researchers. Via flow visualization and pressure measurements, Ueda et al (1990) studied the flutter suppression mechanisms of vertical stabilizers and found that when vertical central stabilizers are applied, the airflow reseparation from the bottom edge of the vertical stabilizers and the air blowing through the center grating of the deck can suppress the occurrence of flutter. Chen et al (2009) studied the effects of the central stabilizer’s aerodynamic mechanism on the flutter stability of truss girder suspension bridges from the energy point of view.…”

Section: Introductionmentioning

confidence: 99%

Flutter mitigation of a superlong-span suspension bridge with a double-deck truss girder through wind tunnel tests

Sun

Lei

et al. 2020

Journal of Vibration and Control

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As flutter is a very dangerous wind-induced vibration phenomenon, the mitigation and control of flutter are crucial for the design of long-span bridges. In the present study, via a large number of section model wind tunnel tests, the flutter performance of a superlong-span suspension bridge with a double-deck truss girder was studied, and a series of aerodynamic and structural measures were used to mitigate and control its flutter instability. The results show that soft flutter characterized by a lack of an evident divergent point occurred for the double-deck truss girder. Upper central stabilizers on the upper deck, lower stabilizers below the lower deck, and horizontal flaps installed beside the bottoms of the sidewalks are all effective in suppressing flutter for this kind of truss girder. By combining the structural design with aerodynamic optimizations, a redesigned truss girder with widened upper carriers and sidewalks, and double lower stabilizers combined with the inspection vehicle rails is identified as the optimal flutter mitigation scheme. It was also found that the critical flutter wind speed increases with the torsional damping ratio, indicating that the dampers may be efficient in controlling soft flutter characterized by single-degree-of-freedom torsional vibration. This study aims to provide a useful reference and guidance for the flutter design optimization of long-span bridges with double-deck truss girders.

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“…Truss is one of the most widely used structures in bridge engineering around the world, especially for high speed railway (HSR) bridges in China, such as Wufengshan and Hutong Yangtze River Bridges both with the main span of 1092 m (He et al, 2017a). Generally, these long-span truss bridges are very sensitive to crosswinds, and bridge-girder geometries play an important role in determining their aerodynamic properties (Miyata and Yamaguchi, 1993; Miyata et al, 1992; Ueda et al, 1990). Thus, in order to predict and optimize wind resistence of such long-span truss bridges, crosswind aerodynamic properties of their main bridge-girders with various geometry parameters should be fully investigated in advance.…”

Section: Introductionmentioning

confidence: 99%

Quantification of aerodynamic forces for truss bridge-girders based on wind tunnel test and kriging surrogate model

Liang

et al. 2021

Advances in Structural Engineering

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This study presents an investigation to quantify the aerodynamics of truss bridge-girders via wind tunnel test and kriging surrogate model. Currently, the conventional methods documented in design specifications only take into consideration the mean drag force at null attack angle. To gain an in-depth understanding on the aerodynamics of truss bridge-girders, experiments on simplified bridge-girder models with various geometric parameters were carried out in uniform flow. A total of 15 truss bridge-girder models with aspect ratio (the ratio of width to height) B/D = 1.0, 1.3, 1.6, 1.9, and 2.2, solidity ratio (the ratio of projected to envelope areas) Φ = 0.20, 0.25, 0.30, 0.35, and 0.40, and two typical truss topologies (Warren and Pratt trusses) were examined in the most concerned range of wind angle of attack α = [–6°, 6°]. These truss bridge-girder models cover most of the high-speed railway bridges widely used in China. Experimental results show that the truss topology has limited effects on the aerodynamics of truss bridge-girders, whereas the effects of α, B/D, and Φ are significant. Based on these wind tunnel results, the ordinary kriging surrogate model was utilized to approximate the aerodynamics of truss bridge-girders. In using this model, aerodynamic force values for test cases can be interpolated with zero variance and uncertainties in unsampled design zones where geometric parameters can be quantified with Gaussian variance.

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Mechanism of aerodynamic stabilization for long-span suspension bridge with stiffening truss-girder

Cited by 17 publications

References 1 publication

Flutter characteristics of twin-box girder bridges with vertical central stabilizers

Flutter characteristics of twin-box girder bridges with vertical central stabilizers

Flutter mitigation of a superlong-span suspension bridge with a double-deck truss girder through wind tunnel tests

Quantification of aerodynamic forces for truss bridge-girders based on wind tunnel test and kriging surrogate model

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